That's not the radiator part #, but the part # for the A/C condenser. The radiator part # would be on a sticker just a few inches away from the radiator cap, on the driver's side, top of the radiator tank. If there is no sticker, there's a good chance it's an aftermarket replacement. A genuine Nissan radiator would also have "NISSAN" molded into the top tank on the passenger side.
No part number or brand name that I can see on the radiator. Fingers crossed it's aftermarket, one less thing I have to do. Now if I could only get the a/c to work.